# Copyright (c) 2007, Enrico Franchi
# All rights reserved.
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
#     * Redistributions of source code must retain the above copyright
#       notice, this list of conditions and the following disclaimer.
#     * Redistributions in binary form must reproduce the above copyright
#       notice, this list of conditions and the following disclaimer in the
#       documentation and/or other materials provided with the distribution.
#     * Neither the name of the University of California, Berkeley nor the
#       names of its contributors may be used to endorse or promote products
#       derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

import os
import sys

from os.path import join

DEFAULT_PATH = '/opt/local/bin/port'
DEFAULT_LOCATIONS = ['opt', 'usr', 'sw']

__found__ = False
__result__ = None

def _found(path):
    __found__ = True
    __result__ = path
    return path

def port_path():
    if __found__ == True:
        return __result__
    
    if os.access(DEFAULT_PATH, os.F_OK):
        return _found(DEFAULT_PATH)
    
    for base in DEFAULT_LOCATIONS:
        base_local_bin = join(base, 'local/bin')
        base_bin = join(base, 'bin')
        if os.access(base_bin, os.F_OK):
            return _found(base_bin)
        elif os.access(base_local_bin, os.F_OK):
            return _found(base_local_bin)
            
if __name__ == '__main__':
    print port_path()